Improving the optical and electrical properties of Zinc Oxide thin film by Cupric Oxide dopant

Nawar, Ahmed M.; Aal, Nadia Abdel; Said, Nariman; El-Tantawy, Farid; Yakuphanoğlu, F.

doi:10.9790/4861-06421722

Cited by 12 publications

(7 citation statements)

References 23 publications

(22 reference statements)

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“…The average optical transmittance is (75) %. As well as, results in to excellent optical quality that is agreed with the studies[8,9].…”

supporting

confidence: 90%

Characterization of ZnO/GaAs heterojunction

Nasir

2019

IJP

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ZnO thin films have been prepared by pulse laser deposition technique at room temperatures (RT). These films were deposited on GaAs substrate to form the ZnO/GaAs heterojunction solar cell. The effect of annealing temperatures at ( RT,100, 200)K on structural and optical properties of ZnO thin films has been investigated. The X-ray diffraction analysis indicated that all films have hexagonal polycrystalline structure. AFM shows that the grains uniformly distributed with homogeneous structure. The optical absorption spectra showed that all films have direct energy gap. The band gap energy of these films decreased with increasing annealing temperatures. From the electrical properties, the carriers have n-type conductivity. From C-V measurement of ZnO/GaAs heterojunciton solar cell at frequency 100, 200 KHz, It is found that built–in potential (Vbi) increases with increase frequency. Also, from I-V characteristic it is observed that the ideality factor is 2.7. Short-circuit current (Isc) is 4.0mA/cm2, open circuit voltage (Voc) is 0.5V, fill factor ( F.F) is 0.7 and the efficiency is about 6.0 %.

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“…The average optical transmittance is (75) %. As well as, results in to excellent optical quality that is agreed with the studies[8,9].…”

supporting

confidence: 90%

Characterization of ZnO/GaAs heterojunction

Nasir

2019

IJP

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“…The dispersion of the zincite in hCZA and hCZAÀ Cs prior to reduction of the active component is considered intimately mixed with the tenorite, making it amorphous to diffraction (as seen in Figure 2). [16,32,33] The high extent of ZnO dispersion is maintained during the activation procedure until Cu begins reducing, which is when growth of the ZnO occurs (Figure 5 (-ii)). As previously stated, it is presumed that the water selectively hydroxylates the ZnOð10 � 10Þ surface once activation of the active component begins, promoting particle growth via Ostwald ripening.…”

Section: Chemistry-methodsmentioning

confidence: 99%

“…Following calcination, the precursor phases completely decompose to form an intimate mixture of tenorite (CuO: 3.95, 3.96 and 4.30 °2θ) and zincite (ZnO: 3.56, 3.85 and 4.05 °2θ) as shown in Figure 2; the zincite crystallite size (Table 1) is so small it is barely visible in the diffraction pattern suggesting it is completely dispersed between the CuO species. [16,32,33] It should be noted that the tenorite crystallite sizes vary depending on the composition of the catalyst; a higher [ZnO] affords smaller CuO crystallites due to a greater interaction between the metal and support making them more stable to thermal sintering. [34] Cs-promotion also causes growth of the CuO crystallites as the [26] and a Zn HTLC (Zn 6 Al 2 (OH) 16 CO 3 • 4 H 2 O) [27] are given below.…”

Section: As-prepared Catalystsmentioning

confidence: 99%

Following Cu Microstructure Evolution in CuZnO/Al₂O₃(−Cs) Catalysts During Activation in H₂ using in situ XRD and XRD‐CT

Farmer

Jacques²,

Waller

et al. 2022

Chemistry Methods

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Understanding how the microstructure of the active Cu 0 component in the commercially applicable Cu/ZnO/ Al 2 O 3 (À Cs 2 O) low-temperature water-gas shift catalyst evolves under various H 2 partial pressures in the presence/absence of a Cs promoter during thermal activation has been investigated. Time-resolved XRD and spatially-resolved XRD-CT data were measured as a function of H 2 concentration along a packed bed reactor to elucidate the importance of the zincite support and the effect of the promoter on Cu sintering mechanisms, dislocation character and stacking fault probability. The rate of Cu reduction showed a dependency on [Cs], [H 2 ] and bed height; lower [Cs] and higher [H 2 ] led to a greater rate of metallic copper nanoparticle formation. A deeper analysis of the XRD line profiles allowed for determining a greater edge character to the dislocations and subsequent stacking fault probability was also observed to depend on higher [H 2 ], smaller Cu 0 (and ZnO) crystallite sizes, increased [ZnO] (30 wt.%, sCZA) and lower temperature. The intrinsic activity of Cu/ZnO/Al 2 O 3 methanol synthesis catalysts has been intimately linked to the anisotropic behaviour of copper, and thus the presence of lattice defects; to the best knowledge of the authors, this study is the first instance in which this type of analysis has been applied to LT-WGS catalysts.

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“…In recent years, the application areas of metal oxides have grown to a large extent due to their new electrical, catalytic and optical properties, so researchers primarily work with these materials because of their optical and structural properties of metal oxides [1][2][3][4]. Transparent oxide conductors such as copper oxide (CuO), zinc oxide (ZnO), tin oxide (SnO) and cadmium oxide (CdO) are of interest due to their semiconductor optoelectronic properties (transparent in the visible region and electrically conducting) [5]. CdO is an n-type semiconductor.…”

Section: Introductionmentioning

confidence: 99%

The Properties of Cadmium Oxide-Carbon Nanotube Nanocomposite Synthesized via Sol-Gel Method

Güler¹,

Başgöz²,

Albayrak³

et al. 2019

European Journal of Technic

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In this study, cadmium oxide based carbon nanotube reinforced material was produced and the optical and electrical properties of the obtained composite were investigated. After the carbon nanotubes used as reinforcement material were synthesized using the chemical vapor deposition method, they were supplemented at different ratios to the commercially available cadmium oxide powders. As another group of samples; cadmium oxide powders were synthesized by the sol-gel method and the carbon nanotubes were again supplemented at different ratios. Synthesized carbon nanotubes were subjected to Transmission Electron Microscope examination. Composite materials obtained were examined by Scanning Electron Microscope. Then, the changes in the electrical conductivity of the composites obtained by temperature were measured. The optical properties of the composites were determined by taking UV-vis spectrometers.

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Improving the optical and electrical properties of Zinc Oxide thin film by Cupric Oxide dopant

Cited by 12 publications

References 23 publications

Characterization of ZnO/GaAs heterojunction

Characterization of ZnO/GaAs heterojunction

Following Cu Microstructure Evolution in CuZnO/Al₂O₃(−Cs) Catalysts During Activation in H₂ using in situ XRD and XRD‐CT

The Properties of Cadmium Oxide-Carbon Nanotube Nanocomposite Synthesized via Sol-Gel Method

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Improving the optical and electrical properties of Zinc Oxide thin film by Cupric Oxide dopant

Cited by 12 publications

References 23 publications

Characterization of ZnO/GaAs heterojunction

Characterization of ZnO/GaAs heterojunction

Following Cu Microstructure Evolution in CuZnO/Al2O3(−Cs) Catalysts During Activation in H2 using in situ XRD and XRD‐CT

The Properties of Cadmium Oxide-Carbon Nanotube Nanocomposite Synthesized via Sol-Gel Method

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Following Cu Microstructure Evolution in CuZnO/Al₂O₃(−Cs) Catalysts During Activation in H₂ using in situ XRD and XRD‐CT